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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b77a4eee46f5c7b3514bed3f8ccc8e2ed178d651476d3b0fd2786d7a047b82b' 
  AND token = 'BHKd0QcNaUW48OaUVdSDU/sF9/cA7Hnlg+sxngPB3wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}